diff --git a/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapter.sol b/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapter.sol
index 102076f093c..4238e6670f9 100644
--- a/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapter.sol
+++ b/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapter.sol
@@ -25,6 +25,8 @@ contract FeeCurrencyAdapter is Initializable, CalledByVm, IFeeCurrencyAdapter {
 
   uint8 public expectedDecimals;
 
+  uint256[48] __gap;
+
   /**
    * @notice Sets initialized == true on implementation contracts
    * @param test Set to true to skip implementation initialization
diff --git a/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapterOwnable.sol b/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapterOwnable.sol
index e93ab8ddcd3..80753695f0a 100644
--- a/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapterOwnable.sol
+++ b/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapterOwnable.sol
@@ -7,6 +7,8 @@ import "@openzeppelin/contracts8/token/ERC20/IERC20.sol";
 import "./FeeCurrencyAdapter.sol";
 
 contract FeeCurrencyAdapterOwnable is FeeCurrencyAdapter, Ownable {
+  uint256[48] __gap2;
+
   /**
    * @notice Sets initialized == true on implementation contracts
    * @param test Set to true to skip implementation initialization